Ratios of heavy hadron semileptonic decay rates

Journal Article · Tue Feb 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.034025· OSTI ID:21504885

Gronau, Michael; Rosner, Jonathan L ^[1]

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1. Physics Department, Technion, Haifa 32000 (Israel)

Ratios of charmed meson and baryon semileptonic decay rates appear to be satisfactorily described by considering only the lowest-lying (S-wave) hadronic final states and assuming the kinematic factor describing phase space suppression is the same as that for free quarks. For example, the rate for D{sub s} semileptonic decay is known to be (17.0{+-}5.3)% lower than those for D{sup 0} or D{sup +}, and the model accounts for this difference. When applied to hadrons containing b quarks, this method implies that the B{sub s} semileptonic decay rate is about 1% higher than that of the nonstrange B mesons. This small difference thus suggests surprisingly good local quark-hadron duality for B semileptonic decays, complementing the expectation based on inclusive quark-hadron duality that these differences in rates should not exceed a few tenths of a percent. For {Lambda}{sub b} semileptonic decay, however, the inclusive rate is predicted to be about 13% greater than that of the nonstrange B mesons. This value, representing a considerable departure from a calculation using a heavy-quark expansion, is close to the corresponding experimental ratio {Gamma}({Lambda}{sub b})/{Gamma}(B)=1.13{+-}0.03 of total decay rates.

• OSTI ID: 21504885
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevD.83.034025; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B QUARKS
BARYONS
C QUARKS
CHARMED BARYONS
CHARMED MESONS
D NEUTRAL MESONS
D S MESONS
EXPANSION
PHASE SPACE
QUARK-HADRON INTERACTIONS
S WAVES
SEMILEPTONIC DECAY
T QUARKS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
D MESONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
MATHEMATICAL SPACE
MESONS
PARTIAL WAVES
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKS
SPACE
STRANGE MESONS
STRANGE PARTICLES
TOP PARTICLES
WEAK PARTICLE DECAY